2008ApJ...680.1053C


Query : 2008ApJ...680.1053C

2008ApJ...680.1053C - Astrophys. J., 680, 1053-1071 (2008/June-3)

The kinematic properties of the extended disks of spiral galaxies: a sample of edge-on galaxies.

CHRISTLEIN D. and ZARITSKY D.

Abstract (from CDS):

We present a kinematic study of the outer regions (R25<R<2R25) of 17 edge-on disk galaxies. Using deep long-slit spectroscopy (flux sensitivity ∼few 10–19 erg/s/cm2/arcsec2), we search for Hα emission, which must be emitted at these flux levels by any accumulation of hydrogen due to the presence of the extragalactic UV background and any other local source of UV flux. We present results from the individual galaxy spectra and a stacked composite. We detect Hα in many cases well beyond R25 and sometimes as far as 2R25. The combination of sensitivity, spatial resolution, and kinematic resolution of this technique thus provides a powerful complement to 21 cm observations. Kinematics in the outer disk are generally disklike (flat rotation curves, small velocity dispersions) at all radii, and there is no evidence for a change in the velocity dispersion with radius. We place strong limits, a few percent, on the existence of counterrotating gas out to 1.5R25. These results suggest that thin disks extend well beyond R25; however, we also find a few puzzling anomalies. In ESO 323-G033 we find two emission regions that have velocities close to the systemic velocity rather than the expected rotation velocity. These low relative velocities are unlikely to be simply due to projection effects and so suggest that these regions are not on disk-plane, circular orbits. In MCG -01-31-002 we find emission from gas with a large velocity dispersion that is corotating with the inner disk.

Abstract Copyright:

Journal keyword(s): Galaxies: Evolution - Galaxies: Formation - Galaxies: Kinematics and Dynamics - Galaxies: Spiral - Galaxies: Structure

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3192 2
2 ESO 478-11 G 02 10 39.660 -22 39 08.22   16.04   15.41   ~ 26 0
3 ESO 299-18 G 02 48 27.971 -40 33 17.60   15.63   14.05   ~ 28 0
4 ESO 201-22 G 04 08 59.922 -48 43 37.49   14.73   14.3 13.8 ~ 54 0
5 ESO 201-28 G 04 15 55.6242376272 -49 21 30.058630992   15.26   13.67   ~ 6 0
6 IC 2058 EmG 04 17 54.3720552624 -55 55 57.738342360   13.90   12.94 13.2 ~ 89 2
7 M 42 OpC 05 35 17 -05 23.4           ~ 3970 0
8 GD 108 HS* 10 00 47.2462375824 -07 33 30.773994012 12.406 13.349 13.563 13.662 13.781 sdB 140 1
9 ESO 568-10 G 10 26 29.352 -21 18 58.02   16.50       ~ 16 0
10 MCG-01-31-002 LSB 12 02 25.785 -04 18 21.57   15.32   14.285   ~ 23 0
11 ESO 380-23 GiC 12 23 19.827 -37 22 57.81   15.78   14.18   ~ 29 0
12 ESO 323-33 GiC 12 53 22.5544026648 -42 08 27.540212604   15.11   14.34   ~ 32 0
13 ESO 381-45 G 13 00 54.4518095544 -36 07 13.888511796   15.48   14.07   ~ 20 0
14 ESO 445-81 EmG 13 56 34.860 -32 37 47.14   14.25   12.96   ~ 46 0
15 ESO 445-85 G 13 58 27.854 -31 46 34.47   16.30   15.33   ~ 22 0
16 UGC 9138 G 14 16 47.157 +23 00 08.31   15.5       ~ 35 0
17 IC 4393 EmG 14 17 48.951 -31 20 57.12   14.59   13.20 13.5 ~ 67 0
18 ESO 385-8 G 14 19 03.7 -34 51 12   15.38   13.95   ~ 33 0
19 IC 4469 G 14 37 20.486 +18 14 57.28   15.6       ~ 30 0
20 UGC 9780 EmG 15 14 01.018 +44 35 26.24   15.50       ~ 51 0
21 LP 916-15 PM* 15 38 59.6479538952 -28 35 36.973634856   12.19 11.62     A 112 0
22 UGC 10453 G 16 34 55.316 +20 34 43.28   15.6       ~ 26 0
23 UGC 10972 LIN 17 46 21.9197060616 +26 32 37.678404084   14.50       ~ 65 0
24 EGGR 264 WD* 23 19 35.3881861344 -17 05 28.465573380 13.279 14.132 14.111 14.07 14.049 DB3 117 0

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2023.01.30-06:44:46

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